21205120

素因数分解:

$2^7\times 5^1\times {\mathrm{17}}^1\times {\mathrm{1949}}^1$

素因数の和:1985

約数の個数: 64

約数和(自身を含む): 53703000

約数和(自身を除く): 32497880

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 64, 68, 80, 85, 128, 136, 160, 170, 272, 320, 340, 544, 640, 680, 1088, 1360, 1949, 2176, 2720, 3898, 5440, 7796, 9745, 10880, 15592, 19490, 31184, 33133, 38980, 62368, 66266, 77960, 124736, 132532, 155920, 165665, 249472, 265064, 311840, 331330, 530128, 623680, 662660, 1060256, 1247360, 1325320, 2120512, 2650640, 4241024, 5301280, 10602560, 21205120]

約数ペア:

[(1, 21205120), (2, 10602560), (4, 5301280), (5, 4241024), (8, 2650640), (10, 2120512), (16, 1325320), (17, 1247360), (20, 1060256), (32, 662660), (34, 623680), (40, 530128), (64, 331330), (68, 311840), (80, 265064), (85, 249472), (128, 165665), (136, 155920), (160, 132532), (170, 124736), (272, 77960), (320, 66266), (340, 62368), (544, 38980), (640, 33133), (680, 31184), (1088, 19490), (1360, 15592), (1949, 10880), (2176, 9745), (2720, 7796), (3898, 5440)]